Hi all - I just got a CL300 and the trap door is not closing when the nib is retracted. Based on the diagram posted earlier here (https://www.fountainpennetwork.com/forum/index.php/topic/271028-how-a-pilot-vanishing-point-works-w-diagrams/), I am assuming that the spring is broken or missing entirely - I haven't had a chance to investigate with anything other than room light and my eyes. Can anyone point me a reference on repairing the trap door, or to someone who performs such services? I can't imagine Pilot has the parts for a 50 year old pen in stock..... Thanks! -Redblur